.contact_form{
  width: 70%;
  position: absolute;
  top: 20%;
  left: 35%;
}
.tree{
  position: relative;
  top: 420px;
  left: 260px;
}
.contact_form ul{
  width: 750px;
  list-style: none;
  margin: 0px;
  padding: 0px;
}
.contact_form li{
  padding: 12px;
  border-bottom: 1px solid #eee;
  position: relative;
}
.contact_form h2{
  font-family: Georgia, 'Times New Roman', Times, serif;
}
.contact_form li:first-child,
.contact_form li:last-child{
  border-bottom: 1px solid #777;
}
.contact_form h2{
  margin: 0;
}
.contact_form span{
  width: 150px;
  margin-top: 3px;
  display: inline-block;
  padding: 3px;
}
.usually input{
  height: 20px;
  width: 220px;
  padding: 5px 8px;
}
.contact_form textarea{
  padding: 8px;
  width: 300px;
}
.contact_form button{
  margin-left: 156px;
}
.special input{
  height: 15px;
  width: 40px;
  padding: 5px 8px;
}
.usually textarea{
  height: 100px;
}
.usually input,
.usually textarea{
  outline: none;
  background: #fff url(../img/attention.png) no-repeat 98% center;
  border: 1px solid #aaa;
  box-shadow: 0px 0px 3px #ccc, 0 10px 15px #eee inset;
  border-radius: 2px;
  transition: padding .25s;
}
.usually input:focus,
.usually textarea:focus{
  background: #fff;
  box-shadow: 0 0 3px #aaa;
  padding-right: 70px;
}
.usually input:focus:invalid,
.usually textarea:focus:invalid{
  background: #fff url(../img/warn.png) no-repeat 98% center;
  box-shadow: 0 0 5px #d45252;
  border-color: #b03535;
}
.usually input:required:valid,
.usually textarea:required:valid{
  background: #fff url(../imgs/right.png) no-repeat 98% center;
  box-shadow: 0 0 5px #5cd053;
  border-color: #28921f;
}
button.submit{
  background-color: #68b12f;
  background: linear-gradient(top, #68b12f, #50911e);
  border: 1px solid #509111;
  border-bottom: 1px solid #5b992b;
  border-radius: 3px;
  box-shadow: inset 0 1px 0 0 #9fd574;
  color: white;
  font-weight: bold;
  padding: 6px 20px;
  text-align: center;
  text-shadow: 0 -1px 0 #396715;
}
button.submit:hover{
  opacity: .85;
  cursor: pointer;
}
button.submit:active{
  border: 1px solid #20911e;
  box-shadow: 0 0 10px 5px #356b0b inset;
}